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Starting AS and DHA concentrations used for serial dilutions on in vitro drug culture plate lots for the HRP-2 assay. The dashed line indicates the nominal final starting concentration of 20 ng/mL after addition of sample for both drugs. Red lines indicate medians and interquartile ranges for drug concentration. From three drug-coated plate lots, a total of 27 starting wells collected were measured (three wells/plate x three plates/lot).
